TRWLock


class description - source file - inheritance tree

class TRWLock : public TObject


    public:
TRWLock TRWLock() TRWLock TRWLock(TRWLock&) virtual void ~TRWLock() static TClass* Class() virtual TClass* IsA() const Int_t ReadLock() Int_t ReadUnLock() virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b) Int_t WriteLock() Int_t WriteUnLock()

Data Members

    private:
Int_t fReaders Int_t fWriters TMutex fMutex TCondition fLockFree

Class Description

                                                                      
 TRWLock                                                              
                                                                      
 This class implements a reader/writer lock. A rwlock allows          
 a resource to be accessed by multiple reader threads but only        
 one writer thread.                                                   
                                                                      


TRWLock() : fLockFree(&fMutex)
 Create reader/write lock.

Int_t ReadLock()
 Obtain a reader lock. Returns always 0.

Int_t ReadUnLock()
 Unlock reader lock. Returns -1 if thread was not locked,
 0 if everything ok.

Int_t WriteLock()
 Obtain a writer lock. Returns always 0.

Int_t WriteUnLock()
 Unlock writer lock. Returns -1 if thread was not locked,
 0 if everything ok.



Inline Functions


            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)
            TRWLock TRWLock(TRWLock&)
               void ~TRWLock()


Author: Fons Rademakers 04/01/2000
Last update: root/thread:$Name: $:$Id: TRWLock.cxx,v 1.1.1.1 2000/05/16 17:00:48 rdm Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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